Hi Ann, that’s a great question and totally valid. There’s a couple factors here. First, since the radishes and lettuce etc. and cool weather crops they are usually finishing up by the time the squash and cucumbers are growing to a larger size. Of course, if you are living in a cooler environment then you could probably grow them straight through the summer. The other thing is that we trellis our cucumber so they aren’t going all over the ground. The squash on the other hand I purposefully put on the end so that you can train them to go outside the garden vs. onto the other beds. It’s true it can be a little bit of a challenge though and something that has to be worked around. These are some of the joys of trying to grow as much as you can in a small space. If you have more space you could make your walkways between the beds much larger to help accommodate the plants. Hope this helps!